Prospector&#39;s drill.



No. 792,344. PATENTED JUNE 13, 1905. J. W. T. OLAN.

PROSPEGTOES DRILL.

APPLICATION FILED JULY 23.1904.

2 SHEETS-SHEET 1.

No. 792,344. PATENTED JUNE 13, 1905. J. W. T. OLAN.

PROSPEGTORS DRILL.

APPLICATION FILED JULY 23 1904.

Y 2 SHEETS-SHEET 2.

l I M Z m k 75 7a? m W p UNITED STATES Patented June 13, 1905.

PATENT OFFICE.

: JOHAN WV. TH. OLIIN, OF SEATTLE, IVASHINGTON, ASSIGNOR OF ONE- HALF TO HENRY M. H. BOLANDER, OF CHICAGO, ILLINOIS.

PROSPECTORS DRILL.

SPECIFICATION forming part of Letters Patent No. 792,344, dated June 13, 1905.

Application filed uly 23. 190a. Serial No. 217,812.

To (all whom it may concern:

The accom anyin drawin s show my improvements in one desirable form.

Figure 1 is a broken sectional view showing my improved drill device in operative posi tion; Figs. 2 and 3, enlarged plan sections of the device, taken, respectively, on lines 2 and 3 in Fig. 1; Fig. 4, an enlarged broken section taken on line .1: in Fig. 1, and Fig. 5 an enlarged broken bottom plan view of the drill.

A is a hollow drill-head having a frame portion formed of an upper cross-plate a, having a central opening I) through it and flanged ends provided with sockets 0, a plate (Z beneath and similar to the plate (0, having flanged and socketed ends and a central threaded opening 6, oppositely-disposed bars ff, segmental in cross-section and fastened, as by the screws shown, in the sockets of the plates a (Z, and a' lower cross-plate 9, having flanged ends it, receiving and fastened, as by the screws shown, to the lower ends of the bars f to only partly close the lower open end of the drill-head. Confined between the plates (Z g is a screw A with a wide blade of comparatively gentle pitch and of a diameter equal to or approximately equal to that of the are described by the outer surfaces of the bars f. The screw center or core may be comparatively slender, and in the edges of the blade are coincident notches 27, of a size to receive the bars f f. Fitting against and removably fastened, as by the screws shown, to the under face of the plate g is a plate It, provided with a plurality of preferably angular tapering cutter-pointreceiving holes.

A central hole Z, larger than the others, is

fitted with a comparatively long and preferably four-sided drill-point m, which may be of chrome-steel or other suitable hard material. The other holes are of smaller size than the central hole Z and are adapted to receive and hold, preferably, three sided cutterpoints. The cutter-points I prefer to employ are artificially-formed crystals produced in a manner discovered by me. It will suffice to say in the present connection that they are harder than quartz, can be readily provided of any size or shape desired, and are admirably suited for my purpose both with regard to cost of prod uction and durability. The cutter-points are so disposed With relationto each other that in the turning of the drill-head they will cut concentric overlapping furrows. Thus the entire surface of the base of the hole that is being drilled will be acted upon by the points in each revolution thereof to thoroughly comminute the material to be excavated. The outermost points a are set at an angle to the perpendicular and are of greater length than the other cutter-points to extend well beyond the rounded ends of the cutter-point holder formed by the plates 70 g to insure the drilling of a hole of sufficiently-greater diameter than the drillhead to permit the ready withdrawal thereof. The apparently arbitrary arrangement of the points (shown in Fig. 5) is well suited for my purpose. All the points fit removably through the holes in the plate In and are held in place thereby against the plate g.

Fitting with desired looseness around the screw and bars is a cylinder 19, which rests at its lower end normally against the shoulders formed by the flanges it. The cylinder when in place thus forms the outer Wall of the screwcontaining chamber of the hollow drill-head.

Passing through the opening 6 and screwed into the threaded opening 6 is one section of a gas-pipe B, locked in place by a jam-nut g, which bears against the plate a. The pipe B forms, in efiect, the drill-head-operating rod and passes upward between antifrictionwheels 9", journaled in a bearing-head s on a tripod or supporting-frame C. Fastened to the top of the rod or pipe B is a comparatively long rod or handle D, arranged at its ends to carry removable buckets E, which may be filled with gravel or the like to give them the desired weight.

In operation the drill is turned by means of the handle D, causing the drill-point m and cutter-points to pierce, cut, and disintegrate the material being drilled and produce on account of the outward-inclined points it a hole of greater diameter than the drill-head, as stated. As the drill-head descends the comminuted material enters the lower part of the drill-head chamber and is gradually raised therein by the turning of the screw A. A single drilling operation may progress until the chamber is filled. IVhen this is done, the buckets are lifted from the handle and the drill-head is raised to the surface, the screw holding the material in the chamber-while the head is being raised. The cylinder 7), which, as shown, is not fastened to the head, but merely surrounds the frame thereof, is then slid upward on the head to open the chamber at all sides and permit the material to be readily emptied therefrom. \Vhen the cylinder 3) is replaced, the drill is ready for another operation.

The pipe-sections are detachably connected together by couplings, and from time to time other pipe-sections may be added as required.

As it is necessary that the frame or tripod C shall remain firmly in one position during the drillingoperation, I provide the legs thereof with detachable driving-points t, with means for fastening the legs thereto. This construction is adapted more especially for use on frozen ground. The points may be detached from the legs, driven into the ground in proper positions, and then the legs secured thereto, as by the bolts indicated.

My improved drill may be readily operated without water, which is always necessary in annular or core drilling, the parts may be disconnected from each other to render them readily portable, and altogether the device is well adapted for general use, particularly in prospecting.

While I prefer to construct my improvements throughout as shown and described, they may be variously modified in the matter of details of construction without departing from the spirit of my invention as defined by the claims.

What I claim as new, and desire to secure by Letters Patent, is

1. In a drilling device of the nature described, the combination of a hollow cylindrical drill-head open at its lower end, a cutter-point holder extending across and partly closing the lower end of said head, a plurality of cutter-points fastened in said holder, a comminuted-material-lifting screw in said head, and means for operating the head.

2. In a drilling device of the nature described, the combination of a hollow cylindrical drill-head open at its lower end, a cutter-point holder extending across and partly closing the lower end of said head, a plurality of cutter-points fastened in said holder disposed, with relation to each other, to out against the entire surface of the base of the hole being drilled, a commiuuted-materiallifting screw in said head, and means for operating the head.

3. In a drilling device of the nature described, the combination of a hollow cylindrical drill-head forming a chamber open at its lower end, a cutter-point holder extending across and partly closing the lower end of said head, a plurality of cutter-points fastened in said holder, a comminuted-materiallifting screw in said head, a readily-removable wall on the head surrounding the chamber portion thereof, and means for operating the head.

4. In a drilling device of the nature described, the combination of a hollow cylindrical drill-head open at its lower end, a cutterpoint holder extending across and partly closing the lower end of said head, a plurality of cutter-points fastened in said holder, acom minuted-material-lifting screw in said head, an operating-rod connected with said head, a frame, a bearing on said frame through which the rod passes, and means for steadying said frame comprising driving-points to which. the

'legs of the frame are detachably secured.

JOHAN w. TH. oLAN. 

